linux-kernel - Re: [PATCH] async: Don't call async_synchronize_full_special() while holding sb

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Message-ID: <49669C90.9070503@linux.intel.com>
Date:	Thu, 08 Jan 2009 16:38:40 -0800
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Grissiom <chaos.proton@...il.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] async: Don't call async_synchronize_full_special() while
 holding sb_lock

Alan Cox wrote:
> On Thu, 08 Jan 2009 14:51:52 -0800
> Arjan van de Ven <arjan@...ux.intel.com> wrote:
> 
>> Dave Chinner wrote:
>>> On Thu, Jan 08, 2009 at 09:46:31AM -0600, Dave Kleikamp wrote:
>>>> sync_filesystems() shouldn't be calling async_synchronize_full_special
>>>> while holding a spinlock.  The second while loop in that function is the
>>>> right place for this anyway.
>>> Out of curiousity, what on earth does
>>> async_synchronize_full_special() do and why does it need to be in
>>> sync_filesystems()?
>>>
>> now that we have asynchronous operations, this function makes sure that all the functions
>> that we started async before this point complete, so that what when you sync, you sync all in progress work.
> 
> So why is it special - wouldn't async_synchronize_all() be a bit (or
> complete_all) be a bit more clear ?

there is 2 types; one synchronizes the global kernel events
one is special in that it only synchronizes the events you give it (via a list head)
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